暖水阻止美国北极海冰的形成

Arctic - n. of or relating to the North Pole or the region around it

erosion - n. the gradual destruction of something by natural forces

walrus - n. a large animal that lives on land and in the sea in northern regions and that has flippers and long tusks

column - n. something resembling a column in form, position, or function

polar bear - n. a large white bear that lives near the North Pole